I would love an advanced feature similar to that of .hgignore and .gitingore: A simple (hidden) file placable in (at least) the root directory for dropbox where I can specify grep-patterns for folders and files to ignore.
By making it a hidden file with regex-patterns, it automatically becomes an "advanced" feature, only available for those who understand what it is and how to use it.
I am loving Dropbox more and more. My use-case/need:
I do cross-platform development (Win/Mac) using an IDE (Intellij), and I have simply put my projects in dropbox, so I can do development and testing across machines/plattforms. This works very well for me, actually. But since IDE layouts and SDK-settings are specified in project-files, I have to close the IDE on one machine Before opening it on another. Otherwise the IDEs start battling over the settings-files. Also, I have to change the SDK-links every time I go from one to the other.
But if I could simply put a line in a ".dropboxignore"-file saying to ignore certain files, that would be wonderful!